feat: 多班级版 v2.0 - Go后端重写 + 43轮代码审查

- 后端从 Python FastAPI 重写为 Go Gin（端口 56789）
- 多班级完全隔离
- 超级管理员独立登录
- 课代表作业管理、排行榜分项排行
- 角色加减分上下限可配置
- 家长改密功能（可开关）
- 周度/月度重置功能
- MySQL 5.7 兼容
- 43轮代码审查+全部修复
- Apache 2.0 许可证

frontend/assets/js/semesters.js

@@ -1,5 +1,5 @@
 /**
- * 班级操行分管理系统 - 学期管理页JS
+ * 多班级版班级管理系统 - 学期管理页JS
  * 
  * 开发者: Canglan
  * 版权归属: Sea Network Technology Studio
@@ -41,7 +41,7 @@ async function loadSemesters() {
     const res = await apiGet('/api/semester/list');
     if (res && res.success) {
         let html = '';
-        const semesters = res.data || [];
+        const semesters = res.data.semesters || [];
         semesters.forEach(sem => {
             let statusText = '';
             let statusClass = '';
@@ -252,7 +252,7 @@ async function viewArchiveData(semesterId, semesterName, page) {
 
     if (res && res.success) {
         const data = res.data || {};
-        const archives = data.archives || [];
+        const archives = data.items || [];
         let html = '';
         archives.forEach(a => {
             html += `<tr>
@@ -288,6 +288,80 @@ function renderArchivePagination(semesterId, semesterName) {
     });
 }
 
+// ========== 周期重置功能 ==========
+
+let pendingPeriodType = null;
+let periodArchivesType = null;
+let periodArchivesPage = 1;
+let periodArchivesTotalPages = 1;
+
+function confirmPeriodReset(periodType) {
+    pendingPeriodType = periodType;
+    const label = periodType === 'weekly' ? '本周' : '本月';
+    document.getElementById('periodResetText').innerHTML =
+        `确定要执行 <strong>${label}重置</strong> 吗？<br>将保存当前所有学生的操行分快照，然后将所有学生操行分重置为初始值。`;
+    document.getElementById('periodResetModal').style.display = 'flex';
+}
+
+async function executePeriodReset() {
+    if (!pendingPeriodType) return;
+
+    const res = await apiPost('/api/semester/period-reset', { period: pendingPeriodType });
+    if (res && res.success) {
+        showToast(res.message || '重置成功');
+        closeModal('periodResetModal');
+        pendingPeriodType = null;
+    } else {
+        showToast(res?.message || '重置失败', 'error');
+    }
+}
+
+async function showPeriodArchives(type, page) {
+    var periodType = type || periodArchivesType;
+    page = page || 1;
+    periodArchivesType = periodType;
+    periodArchivesPage = page;
+
+    const label = periodType === 'weekly' ? '周' : '月';
+    document.getElementById('periodArchivesTitle').textContent = label + '归档数据';
+
+    const res = await apiGet('/api/semester/period-archives', {
+        period: periodType,
+        page: page,
+        page_size: 50
+    });
+
+    if (res && res.success) {
+        const data = res.data || {};
+        const archives = data.items || [];
+        let html = '';
+        archives.forEach(function(a) {
+            const resetByLabel = a.reset_by === 'auto' ? '自动' : '手动';
+            html += '<tr>' +
+                '<td>' + escapeHtml(a.period_label) + '</td>' +
+                '<td>' + (a.rank_position || '-') + '</td>' +
+                '<td>' + escapeHtml(a.student_no) + '</td>' +
+                '<td>' + escapeHtml(a.student_name) + '</td>' +
+                '<td>' + a.final_points + '</td>' +
+                '<td>' + resetByLabel + '</td>' +
+                '<td>' + formatDateTime(a.archived_at) + '</td>' +
+            '</tr>';
+        });
+        if (archives.length === 0) {
+            html = '<tr><td colspan="7" style="text-align:center;">暂无归档数据</td></tr>';
+        }
+        document.getElementById('periodArchivesList').innerHTML = html;
+
+        periodArchivesTotalPages = data.total_pages || 1;
+        renderSmartPagination('periodArchivePagination', periodArchivesPage, periodArchivesTotalPages, function(p) {
+            showPeriodArchives(periodArchivesType, p);
+        });
+        document.getElementById('periodArchivesModal').style.display = 'flex';
+    } else {
+        showToast(res?.message || '获取归档数据失败', 'error');
+    }
+}
+
 loadSemesters();
 
 window.fillSemesterDates = fillSemesterDates;
@@ -302,5 +376,8 @@ window.confirmAssociate = confirmAssociate;
 window.showArchiveConfirm = showArchiveConfirm;
 window.confirmArchive = confirmArchive;
 window.viewArchiveData = viewArchiveData;
+window.confirmPeriodReset = confirmPeriodReset;
+window.executePeriodReset = executePeriodReset;
+window.showPeriodArchives = showPeriodArchives;
 
 })();